Design, fabrication, and testing of Wolter-I x-ray optic for Swift Solar Activity X-ray Imager (SSAXI)-Rocket

Jaesub Hong; Suzanne Romaine; Ricardo Bruni; Charles G. Davis; Nicholas Thomas; Sophia A. Sánchez-Maes; David Caldwell; Elias Aguirre-Contreras; Ed Hertz; Chet O. Speegle; Christopher S. Moore

doi:10.1117/12.3020233

21 August 2024 Design, fabrication, and testing of Wolter-I x-ray optic for Swift Solar Activity X-ray Imager (SSAXI)-Rocket

Jaesub Hong, Suzanne Romaine, Ricardo Bruni, Charles G. Davis, Nicholas Thomas, Sophia A. Sánchez-Maes, David Caldwell, Elias Aguirre-Contreras, Ed Hertz, Chet O. Speegle, Christopher S. Moore

Author Affiliations +

Proceedings Volume 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray; 1309355 (2024) https://doi.org/10.1117/12.3020233
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Swift Solar Activity X-ray Image (SSAXI-Rocket), mounted on the High-Resolution Coronal Imager (Hi-C) as a sub-payload, is a wide field solar X-ray imager designed to image Solar X-ray flares at high cadence (>5 Hz). SSAXI-Rocket consists of a Wolter-I optic with a focal length of 1 m, coupled with a monolithic CMOS X-ray sensor at the focal plane. The optics for SSAXI-Rocket were fabricated using the Electroformed Ni Replication (ENR) technique at Center for Astrophysics, Harvard-Smithsonian. Each optic has both parabolic and hyperbolic sections with 62 mm diameter at the inflection plane with a total optic length of 18 cm. The performance of the flight and flight spare optic mounted on a spider was measured at the Marshall Space Flight Center (MSFC) Stray Light Testing Facility (SLTF) to characterize the Point Spread Function (PSF) and Effective Area (EA). The flight optic selected for SSAXI-Rocket shows on-axis 16′′ Half Power Diameter (HPD) and 5′′ Full Width Half Maximum (FWHM) at 4.5 keV, exceeding the 23′′ HPD and 9′′ FWHM requirement. The effective area is about 0.64 cm2 at 4.5 keV. Coupled with the fast readout of an X-ray CMOS sensor, this optic enables rapid high-resolution X-ray imaging over a wide field of view (> 20′ x 20′). Here we review the design, fabrication and testing of the SSAXI-Rocket optic and summarize its performance.

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Jaesub Hong, Suzanne Romaine, Ricardo Bruni, Charles G. Davis, Nicholas Thomas, Sophia A. Sánchez-Maes, David Caldwell, Elias Aguirre-Contreras, Ed Hertz, Chet O. Speegle, and Christopher S. Moore "Design, fabrication, and testing of Wolter-I x-ray optic for Swift Solar Activity X-ray Imager (SSAXI)-Rocket", Proc. SPIE 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, 1309355 (21 August 2024); https://doi.org/10.1117/12.3020233

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